.welcome {
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  .welcome_title {
    font-size: 40px;
    font-weight: 900;
    font-family: '楷体';
  }
  img {
    width: 60%;
    margin: 0 auto;
    border-radius: 20px;
    box-shadow: 5px 5px 10px 0px rgba(0,0,0,0.75);
  }
}